The role of the natural hypoxic environment of the middle mountains in the growth of the erythrocyte link of the blood - erythrocytes, hemoglobin and the level of the average concentration of hemoglobin in erythrocytes, reflecting the level of iron sufficiency in the blood in children with autism spectrum disorders (ASD) is shown. The results of clinical blood tests showed that after 10-day courses of recovery in the mountains in the blood of children there are compensatory reactions associated with the restructuring of the body's blood supply - an increase in the number of red blood cells due to their intake from blood depots, which allows an increase in the level of hemoglobin and the volume of oxygen carried and improves blood circulation in the body of children.

The cross-over effect of the influence of the hypoxic environment and physical activity, designated as “cross-adaptation”, on the health promotion of children with autism spectrum disorders (ASD) was investigated. A model has been developed for correcting the health of children with ASD on the basis of systematic seasonal 10-day physical training courses in a natural moderately hypoxic environment. Systematic health improvement courses with the use of special physical exercises in conditions of natural mountain hypoxia develop cellular and humoral mechanisms of immune responses, increase immunity, improve the physical and psycho-emotional state of children. Among 50 young and adolescent children diagnosed with ASD, after 4 10-day health improvement courses during the year, 20% of young children and 80% of adolescents showed an increase in the activity of cellular and humoral immunity. The proposed model for correcting the health of children with ASD is a promising universal non-drug way to increase immunity, stimulate the processes of adaptation and socialization of children with ASD. In the opinion of parents, after health improvement courses, many children have a desire to communicate with both parents and other children.